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Systems, methods, and apparatus for estimating power time of use

  • US 9,003,063 B2
  • Filed: 11/16/2011
  • Issued: 04/07/2015
  • Est. Priority Date: 11/16/2011
  • Status: Active Grant
First Claim
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1. A method for estimating power time of use, the method comprising:

  • storing power usage data and local time stamps;

    receiving data comprising network time;

    adjusting the local system time with a proportional, integral, and derivative (PID) loop, wherein the PID loop adjusts the local system time based at least in part on a difference between a local clock and the received network time;

    storing, with the power usage data and local time stamps, an indicator when the difference is greater than a predetermined error value;

    determining synchronization has occurred when the difference is less than or equal to a predetermined synchronization value; and

    revising one or more of the stored local time stamps after power loss and restoration when synchronization is determined, and associating and storing revised time stamp values with the power usage data, wherein revising comprises;

    retrieving one or more local time stamps corresponding to the usage data;

    detecting the power loss by subtracting a current time from a start time generating a resultant value;

    determining the power loss has occurred if the resultant value is negative;

    determining the power loss has occurred if the resultant value is greater than a predetermined interval; and

    calculating one or more revised time stamp values, wherein the revised time stamp values have been adjusted with the PID loop.

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